Truth is a statement that adheres to the tangible reality. Nothing complicated.

You have a preference for having truth when it comes to spirituality, your preference is knowing the facts; god doesn't exist. So you clearly prefer truth, to a fabrication in that area, as you probably do in many areas. For me, there is no higher virtue than truth and honesty, but if the people you are interacting with do not extend you the same luxry then you can lie as much as you wish. "Treat people as best you can when you first meet them, after that treat them how they treat you" and that.

I hate lying (although I'm great at it), but if it's a choice between not hurting someone and telling the truth, the former wins most of the time. Life sucks big time as it is, no need for me to make it harder on others if I can help it. No matter what front we put up, people are extremely vulnerable, so sparing them further pain usually takes precedence.